A Static Tissue Removal Scheme for Improving TGRAPPA and
KtGRAPPA with High Acceleration

This work
analyzes the source of temporal blurring of the conventional DC removal
method for tGRAPPA and ktGRAPPA and presents a modified image sparsification
scheme to address the problem. The proposed method automatically identifies
dynamic tissue locations and removes DC signals from static tissues only
before parallel imaging reconstruction. Our invivo results from cardiac cine
MRI demonstrates that this new method can reduce aliasing artifacts and
improve SNR for high acceleration tGRAPPA and ktGRAPPA without losing
temporal fidelity.